Trimming machine



Oct. 28, 1941. w. 'r. B. ROBERTS TRIMMING MACHINE Filed June 4, 1940 7 Sheets-Sheet 1 Oct. 28, 1941. w. T. B. ROBERTS 2,260,483

TRIMMING' MACHINE Filed June 4, 1940 '7 Sheets-Sheet 2 1941 I w. T. B. ROBERTS 2,

TRIMMING MACHINE Filed June 4, 1940 V'She etS-Sheet 3 m ma VENTURL 1 rawm; l 72 Oct. 28,1941. w ROBERTS 2,260,483

TRIMMING- MACHINE Filed June 4, 1940 7 Sheets-Sheet 4- Oct. 28, 1941.

W. T. B. ROBERTS TRIMMING MACHINE '7 Sheets-Sheet 5 Filed June 4, 1940 28, 1941. w. 'T. B. R'OBERTS 2,260,483

'TRIMMING MACHINE Filed June 4, 1940 7 Sheets-Sheet 7 Patented Oct. 28, 1941 TRIMMIN G MACHINE William Thomas Buckingham Roberts, Leicester,

England,assignor to United Shoe Machinery Corporation, Borough of Flemington, N. J., a corporation of New Jersey Application June 4, 1940, Serial No. 338,723

In Great Britain June 23, 1939 Claims. (Cl. 12-835) This invention relates to machines for trimming the toe portions of partially fabricated shoes to prepare the lasting margin of an upper for a subsequent toe-lasting operation. The machine herein ilustrated as embodying the invention is intended primarily for operating on shoes of the McKay type.

For purposes of this description the term lasting margin is intended to include all the layers of material at the toe end where such a margin commonly comprises a layer of outer leather, a lining, a doubler, and a toe box.

A machine of the type herein described is provided with a cutting bed in which a U-shaped recess is formed to receive the toe end of a shoe and on which the lasting margin is spread out while a knife is operated to sever surplus ma terial of the margin with movement from an initial position over the forepart of the shoe in a direction away from the heel end. As the knife travels in the direction specified it seversa strip from all the layers of the outspread lasting margin and may, if the outer leather is too thick, skive some material from the inner surface of that layer. Such a machine is also provided with spreaders arranged to travel across the cutting bed ahead of the knife to spread the lasting margin and to compact it firmly against the bed in preparation for the trimming cut.

One object of the present invention is to provide means for pressing a shoe endwise against the cutting bed with sufiicient power to maintain the shoe against dislodgment during the operation of the trimming knife.

Another object is to guard against accidental operation of the machine when no shoe is located as it should be to undergo a trimming operation. The several mechanisms, except those for locating and clamping the shoe, are operated'in a certain sequence by cams that derive their motions from a power-driven clutch and, although manual operation is required to locate the shoe and clamp it in the desired position fora trimming operation, a shoe located as aforesaid is necessary to transmit the motion required to trip the clutch.

The invention also comprises other improvements one of which is a cutting bed capable of being adjusted to conform to toe portions of different widths, and another of which is a flexible shearing member combined with the cutting bed to partake of such adjustments.

Referring to the drawings,

Fig. 1 is a right side elevation of the head por tion of a machine embodying the present invention, the parts thereof occupying their initial positions;

Fig. 2 is a sectional view from the sameside of the machine as Fig. lbut omitting some of the elements'and again representing the included elements in their initial positions;

Fig. 3 is another sectional view and includes mechanisms omitted from Fig. 2;

Fig. 4 is a top plan view of the articulated cutting bed provided with adjusting means by which its effective width may be regulated;

Fig. 5 is a sectional View of the cutting bed in the plane indicated by line VV in Fig. 4;

Fig. 6 is a sectional view of the assemblage indicated by line VIVI in Fig. l;

Fig. '7 is a sectional view of the assemblage indicated by line VII-VII in Fig. 2; f

Fig. 8 is a top plan view in, a plane slightly above that of the trimming knife (see line VIII-VIII in Fig. 2) and includes the knife, a

chip-removing member, and means for operating the latter;

Fig. 9 is a sectional view'of the assemblage intersected by line IX--IX in Fig. 8;

Fig. 10 is an elevation and partial section of the structure intersected by line X-X in Fig. 2;

Fig. 11 is a top plan view of an assemblage comprising two individually adjustable. gages both arranged to be engaged by the upturned bottom of the forepart of the shoe to determine its level for a trimming operation;

. Fig. 12 is a top plan View partly in section (see line 2HI-XII in Fig. 3) of an assemblage coinprising the elements provided to spread the lasting margin and press it against the cutting bed;

Fig. 13 is a front elevation (see broken arrow XIII in Fig. l) of the clutch assemblage and includes elements of the clutch-controlling mechanism partially represented in section;

Fig. 14 is a view similar to Fig. 13 except that it includes additional elements of the clutch-controlling mechanism;

Fig. 15 is a side elevation, partly in section, of a shoe about to be trimmed by the machine herein described, and located in the desired position by the various elements provided for that purpose; and

Fig. 16 is a schematic View from above and represents successive positions of a pair of fingers for spreading and compacting the margins to be trimmed.

The illustrated machine comprises a frame 1 adapted to be supported on a column 3, and having bearings for a clutch shaft 5 and a cam shaft I5. A continuously rotated pulley l loosely mounted on the shaft is the driving member of a clutch II by which this shaft may be operated. Gears I3 transmit rotation from the shaft 5 to the cam shaft I5 upon which are secured with which the knife 31 may cooperate.

the rear ends of a pair of rods 2,9,;29. spaced apart I widthwise of the machine. The forward ends of the rods 29, 29, are connected to acutter car- This carriage is arriage 33 by pins 3| (Fig. 2). ranged to slide to and fro onguideways 35 (Fig. 7) on the machine frame I. "'The'guideways35 are inclined and their rearward ends are higher than their forward ends. circular knifel3'I-and a work-pressing device comprising a series of resilient fingers 39. k The machine frame I (Figs. 1 and 5). has a shelf portion '43 which has a supporting surface 44 the plane of which islparallelwith the path of the knife '31. A groove.45 in'the portion 43 extends crosswise' of the machine. Arranged in the groove 45 is a bar 41, oneend of. which isbolted to the under surface of a" flat plate 49, there being a considerable'iportion 'of'the bar 41 projecting beyond theright hand side .of the plate 49. The plate 49 is of general'rectangularoutline (Fig. 4) eX'cept'that its" forwardside has a recess of a shape similar to that of the toe-portion era The slide 33 carries Ia porting blocks 59, BI may be adjusted according to the width of the toe end of a shoe.

Each bed block 63 has a dished surface 19 on which it is intended the lasting margin of a shoe shall be outspread and supported. Between the upstanding confronting surfaces of the supporting blocks 59,,6I and the bed'blocks 63 (Fig. 5) is an upstanding flexible steel strip 8|, the upper edge of which is arranged to lie in the cutting plane of the knife 31 to provide a shearing edge The lower edge of thestrip 8I rests on the upper ends of a seriesofadjusting screws 83 threaded in the blocks59, BI and arranged to adjust the strip heightwise. The screws are secured by lock nuts 85.

Each block 59, IiI has an arcuate groove 81 in its bottom surface, the centre of curvature of shoe but'larger'than the largest toej-portion'to be operated upon by the "machine, this recess providing ample clearance for a' shoe to be trimmed in the 'machine'and providing irea'dy access to adjusting screws "hereinafter described. The thickness of the bar 41 is such'that'the under surface of the fiat plate 49 secured thereto may bear on the surface 44. The'plate '49 carries a cutting bed comprising adjustable articulated blocks and this assemblage'may be withdrawn sidewise from its operating position in the machine. When the cutting bed is'in the operating position a tongue 5| '(Fig. 6) formed on the inner end of the bar 41 projects under a small plate '53 bolted to the machine frameto guard against dislodgment of the assemblage. To the outer end-portion of the bar is' secured a small rec tangular plate 55, by which theoperator may pull out the block assemblage when the retaining screw 51 is removed. This screw'extends through the plate -55 and the bar 41 and is screwed'into the frame. g The cutting bed (see Fig. 4) comprisesa-le'fthandsupporting block '59-an'd a right-hand sup-- corresponding supportingblock by means of-a plate 61 and a bolt 69, preferably with a spring washer ll against each plate. securedin the blocks'59 and'BI by 'set-screws 13. The meeting ends of the blocks 63-have cylindrical male and female formations 15, I1, one-of which is nested in the other to form an -articulated hinge-joint (Fig. 4) without a connecting which'coincides with the axis of the hinge joint formed by the members 53. The grooves 81 are occupied "by a Icurved' guide 'bar 89 "of similar curvature, 'whichbar '89 is secured tothe plate 49 and guides'the blocks in an are when they are being "adjusted, Adjusting movement of the parts 59, 'BI and 63 is effected by right-and-left screw-threads on a rod '91 having a knob'9'5 and engaging internally threaded studs 93"pivoted 0116 in each of the parts 59,5 I.

The parts '59 and'6I are retained on the' sup porting plate 49 by a retaining plat 91 and screws I03, the plate 9! being space-d fromthe supporting plate 49 by cylindrical tubes 99 arranged in'slots IIlI in'the sections 59, -6I.

Correct heightwise adjustment of the 'flexibl shearing strip 8I "may be obtained from a flat gauge plate I95 (Fig. 6) affixed to a lateral ex} tension I07 of the machine frame I on-alevel tive to-the trimming'knife 31 the rnachii'l'e is pro vided with two individually-adjustable abutments for engaging the forepart of the shoe bottom, one at the ball portion and theother near the toe end portion of the insole. a H

The abutment for 'engag-ing' th'e ball portion (Figs-2, 11 and 15-) comprises a plate I99 as wide as a forepart and arranged to,-'exten'd 'acrossthe lasted side margins, and the abutment for engaging-the toe portion of the insole comprises a narrowfinger I II formed on anwverlapping plate II:3. i i 1 The plate I99 is secured 'toa'carrier .I I5 which is arranged on a rock shaftIII but notv affixed thereto. The shaft is arranged in bearings-in the m'achine'frame. The carrier .I I 5 has a downsv wardly: extending lug H9 having an adjusting screw .IZI threaded tlierethrough. .A tension pin "and without a gap. The axis -of..-this joint coincides with *the aX-isabout' which the two supispring I23'holds the adjusting screw I21 against a pin I25 fixed in-the machine frame I, to prevent upward displacementof the ;platev N19. The plate II3 lies just above the plate 'I99'andis affixed greener:

down to determine theslant' of the forepartan'd the heightwise position of a shoe, such -adjust-' ments thereby serving to determine the amount of upper material to be 'seve'red'by the trimming knife 31. I

The machine also has a rubber-covered worksupporting roll I35 (see Fig. 1) adaptedto be raised into contact with the forepart of. the shoe (Fig. near its toe-cap-lin'e while the bottom of the shoe is uppermost. The roll I is journaled in a yoke I31 secured in. ;the upper end of a tubular jack-post I39. The latter has telescopic connection with a treadle-rod I45 so connected to a treadle (not shown) as .to be raised by depressing the treadle. :Upward move-, ment of the rod I45 is transmitted to the post I39 by a compression spring-'I43and a pin I4I afiixed to the post. I

The post I39 is freely movable in a slot I41 formed in-a guide-bar I49 andzthis bar is affixed to the frame I with provision for length- Wise adjustment to place the path of travel of the supporting roll wherever desired.

The trimming knife 31 travels from the front toward the rear of the machine to perform the trimming operation but is preceded'by a pair of upper-margin spreading fingers I5I that stand initially out of register with the U-shaped recess in the cutting bed as represented in Fig. 3 and Fig. 15, and in their spread relation as represented in Fig. 12. In'this position they do not obscure visibility of the work in the recess. When a cycle of operation is initiated by tripping the clutch II' the fingers I5I, now well above the cutting bed, are carried first toward the cutter 31, as a result of which they are placed over. the forepart of a shoe but far enough above it to clear the lasting margin that projects above the insole. On reaching this position theyare depressed nearly, if not quite, .into contact with the insole. Thereafter, the fingers are moved away from the heel end of the shoe and are swung apart to spread the lasting margin over the bed blocks 63.

The means for swinging the spreading fingers I5I includes two operating cams 5I3 and 5 (Fig.3) the first of which opens the fingers only far enough to spread, the lasting margin on. the bed blocks 63 and theother of which opens crank lever 493. The cam 5II cooperates with aroll 509 carried by an arm 502 pivotally mounted on the frame I. ,A flat face 505 on the arm 502 cooperates with a roll 50I to communicate upward movement of the arm to'a bell crank lever 49I. The bell crank levers'49I and 493 are movable about a common axis and are adjustably connected by a screw 5I1 whereby the roll 503 may be initially adjusted toward and from its cam 5I3 to regulate the range of spreading motion to be imparted to the spreaders I5I according to the widthwise adjustment of the cutting bed.

The bell crank lever 49I has a'pair of upwardly extending arms 495 andthese arms are connected respectively with the Spreaders I5I by ball-end links 491. After the cam 5I3 and the roll 503 have opened the spreaders I5I far enough to spread the lasting margin on the cutting bed the spreaders compress the margin and the high portion of the cam 5II thereafter. opens the Spreaders to a greater extent.

- Although 'the fingers I5I= are moved to and fro lengthwise of a shoe by corresponding movements of a carrier I53, they are not directly mounted on'thiscarrier but are mounted on a hinge portion I65 of a carrier I61 to. which'they are connected by individual pivot pins I63 (Figs. 3 and .12). The carrier 161,: in addition to partaking of the to-and-fro movements ofjthe'carrier I53, receives individualup-and-down movements by. which the-finger I5I ,are depressed during their trave'l awayfromthe-heel-end of a shoe but raised during their travel toward the heelen'ds: 3

The carrier I53 is mounted in guides I55 (Fig. 6) in the frame land is reciprocated along these guides by means-comprising a link I51 and a cam-operated lever I59 (Figs. 1* and 3), the lower end of whichis mounted on a fulcrum memberI6I. m'

' Still referring'toFigs. 3 and 12, a carrier I69 is arranged abovethe carrier I61 and is connected thereto by toggle members HI and I13, the latter being ainxed to a rockshaft I15 that not only provides a pivotal connection with thecarrier I69 but also projects therefrom to provide connection with an operating arm I11. These parts are so related that the-fingers I5I partake not'only of up-and-down movements of the carrier. I69,but also of individual up-and-down movements of the carrier I61 produced by. operation ofthe toggle members Ill and I13. In the course of a cycle the fingers I 5 I execute the following motions, starting from their initial positions as shown in Fig.3 and Fig. 15, in which they are spread apart, elevated and at an intermediate pointin their travel toward the 7 heel end of a shoe. Referring to Fig. .16, the fingers I5I are represented in successive positions A, B, C, D, E and F. 'Disregarding the motions of the fingers towardand from the .bed blocks 63, the other motions of the fingers are indicated in this figure by arrows. The fingers stand initially at A, A. They first move toward the heel end of a shoe, farenough to overhang the forepart of the insole (positions B, B); next, they swing toward each other about their I respective pivot pins I63 (C, C) next, they are depressed without engaging the lasting margin of the upper; next, they are shiftecl'away from the heel end of the shoe far enough to bend the lasting margin over the bedblocks 63, 63 (D, D) and at the same time they are spread apart with movement about their pivot pins- I63 (E, E) to produce corresponding spreading of the lasting margin (at this stage they may yield upwardly, if necessary, to ride over the out-turned lasting margin); next, they are positively depressed with a movement sufficient to compact the outspread margin and conform it tothe upper surface of the bed blocks 63; next, they are raised slightly, opened further and resume their travel away from the heel end of the shoe far enough (F, F) to clear the path of travel of the oncoming trimming knife 31; next, they are raised to their initial plane; and finally, they return to their. initial position (A, A) at an intermediate point in their travel toward the heel end of the shoe.

Referring to Fig. 3, the toggle I1 I, I13 remains broken throughout the travel of the carrier I53 toward the heel end of a shoe and remains straight throughout the travel in the opposite direction, and it is, therefore, straight when the carrier I59 is depressed to compress the, out-, spread lasting margin against the, bed blocks .63.

' plunger exerts The mechanism for operating theselto'ggle :members' comprises;a-rod Ii'|9, a spring platei;I 83tca-r-: ried thereby,- a stationary 'block. 1.85: that. projects I between the rod and the spring "plate-Ito" p'royide considerable: frictional resis'tance, :and a light tension spring I 8 I 'by which'the toggle is-l'strai'ght ened when frictionalresistance is removed. The

' friction block I85 is: connectedto a supporting bracketby a pirr I181; Whn'zthe carrier I53 nearest theheel nd of a shoe, itheflsprin'g: plate" P83 is disengaged frommthe frictioni block 1. 5 and the spring I8If =then straightens the toggle; The travel of the carrier I53 away from.the heel end "of the shoe carries the plate I83 'along the block I85 and the latter'is again clamped with rier returns to its-initialposition; l a i. it

' The carrier I69 is normally depressed byvla spring plunger 23I (Fig. 3) that yields-'to'vpermit the Spreaders I5I toride over the outspreadlasting margin on thebed blocks 53. This'sprin'g upward force against an adjustg ing screw threaded in an arm I91 and'this arm: is

' sufficient force to break *"the' toggle when the car rigidly but adjustablyconnected to an arm I93: Both' arm's are mounted on a ful'crum pin I95 carried by the carrier I53, 'Ihe' arm- I QS pr ce jects'into a recess -I9I in tl iecarrier I89"'and is effective to raiseand lower the fingers I5iI'while the toggle *I'II, H3 is straight. Y The adjustable connection between the arms; 9-1 and F I 93 a pro vided'by a forked extension 203 of th'e ar-irr "I 93 9: block I99, and an eccentric 'pin-2IJIL I his' pin'has circular bearings; in the extension 2il3 'and' in the b1ockI99' and the latter has flatbearing n a slot 205 inthe arm I91. "This cohnectionpro vides for relative angularadjustment of the arms 2| I on the" arm 2 I3 form an operating connection; The lever 229 and the "arm 2I'I'are'provi'ded'with abutting 'portions 233 and 235 bywhich the rm 2II may be moved upwardly, but its downward movement is derived from" a screw "abutment 239 threaded" in"an extension 23'! ot the lever 229. This 'screwfabutment 'd'oes'not' act directly on the arm 2I-I" but acts" on a pivotaljoint-by" which an arm 223 an d' a plate 22 I "are-connected} Moreover, the abutments 233*jand 239 are -so spaced" as to'afford some lost motion'of the lever 229, to the end thatthe plate 22 I'flmay be utilized to grip and release a curved -bar'2I9 carried by 60. the arm 2I'I. The "bar 2 l9 occupies an" opening 7 formed .in the plate 22I' for its reception andwhen the plate 221 is maintained agaihlst a ;stationary abutment .221 by two tensiojnsp ings- 22-5 as shownin Fig. v1, the bar 2 I 9*may slide" ay through the plate and thu'stake j 'any g r'equired of it by the outspreadlastirig'margin on' the bed blocks63. Ontheothe r hand, when the screw abutment 239 strikes. and; depresses the pivotal joint between'the armv 223 and the plate 22I the latter becomes cantedsufficien lyyto grip the bar 219 andin consequence" thereof it; transmits further downward movement. oft/the -a1eut-. ment 239 to the-arm 2I'l'. Thefingerspl5 -.l are;

" the. tog le.

thus depressed positively to compress "the lasting margin. I

- When the parts of the mechanismlast described.

return to their initial positions the abutments I contact with the .bed blocks 63 after the margin has been conformed to these blocks by the spreaders I51 asihereinbefore described. The pressers 39 are ,thin,rfiat plates extending vup and .down 7 and arranged in face-to-face contact with each other, and their lower extremities engage the Workijust ahead of the cutting portion of the knife. Each .presser is provided with a slot 293 near/its upper end to receive a guide rod 244 1 that extends through and beyond all thepressers of the group... The pressersare also provided Withzslots near their lower ends through which a guide rod E243zextends, but some of these slots indicated at 295 are longer thanthose indicated at 291. The pressers having the'longer slots may occupy lower positions than those having the shorter slots. This detail of construction provides for counteracting irregularities in the outspread margin .of the upper when it is conformed to irregular formations on the bed blocks 63 hereinafter described. The pressers 39 are spring-biased downwardly by individual springs 245 seated on their upperends and maintained under initial deflection by an adjustable abut-' ment.

- The ends of the guide rod 243 are secured in ears formed on a movable plate '24! but the guide rod 2 4I extends through and beyond slots 28'! formed in corresponding ears of the same plate, and their end portions are provided with cam rolls 289 by which thepressers maybe raised to clear the thin shearing strip 8| that projects above the bed blocks 63.

Although the knife carriage '33 travels to and fro in a straight path,. the plate 24! is capable of a slight individual up-and-down movement and for this purpose theplate is arranged to slide on a flat guide plate aflixed to a pillar 249-mount ed in the-carriage to provide anchorage for the knife 31. 'The'plate 241 is also provided with cam rol1s25fl and these are arranged in cam tracks ,25I formed in a pair of bars 253, one at each side of the assemblage. .Th 'forwardends of the bars .253are mounted on stationary pivot pins .255, the frame I being provided with brackrear ends of the bars 253 may .be moved up and down by toggles each comprising links 26I and 263 connected/by'a pivot pin265 ,at the knee of Thelinks 26I are connected to the brackets 25'! by anchor pivots 259.

their lower positions but when the toggles are broken the bars are slightly raised thereby. Each knee pivot 265 is provided witha bearing block 27.9 in which a hole is bored to provide a bear.

ing for an operating. rod 215. These rods are;

capable of sliding endwise through the blocks 219 and-are provided with shoulders 21'! and nuts The con struction 1s such that when the toggles are straight, as shown in Fig. 2, the bars 253 occupy affixed 'to members 301, these members are bar-'- by the knife carriage 33 and for this purpose the forward ends 269 of the rods are connected by pivots Z1| with members 213 aflixed .to .the carriage.

When the cutting stroke of the knifet31 is nearly-but not quite completed, that is, afterits cutting edge has traveled beyond the stationary shearing strip 8|, the shoulders 211- break the toggles and thereby raise thepressers 39 far enough to insure their clearing the trimmed lasting margin during their return movement to their initial position. Just before this return movement is completed the nuts 28| strike the blocks 219 and thereby straighten the toggles to depress the bars 253 for the next trimming operation. 7

When the knife carrier 33 is at an intermediate point in its cutting stroke, that is, at a point where the pressers 39, or some of them, might strike the stationary shearing strip 8| in the ab.-

sence of shoe material to cover the strip, the

rolls on the ends of the guide bar'24l encounter supplemental cams 29] on the bars 253 and are thereby raised far enough to carry the pressers over the strip. r

.For. some kinds of work, particularly men's shoes in which the upper materials are comparoutspread toe margins thereof, to trim them in such a way as to avoid uneven thickness when these materials are subsequently turned inwardly upon the insole and pleated in the toe-lasting operation. Accordingly, for such work the margin-supporting surfaces of the bed blocks 63 may be provided with a series of ridges or lands :283 (Figs. 4 and 6) between which cavities or .Moreover, all portions of an outspread margin that overlap the shearing strip 8| will be completelysevered on a line established by the curvature of that strip. 7 i

Referring to Figs. 2, 8 and 9, a chip-clearing member 3|1 is arranged to swing to and fro in the space between the pressers 39: and the cutting segment of the knife 31. This member is formed on a ring 3| seated on the'upper surface of the knife and maintained in concentric relation thereto by a concentric shoulder 30! formed .on the lower end of the pillar 249 to which the knife is anchored. Two pins connect the ring 3| and a ring 309 and extend through segmental slots 3|5 in an interposed plate 303. Although the rings 399 and 3 may oscillate vas one, the

plate 303 and an upper plate 305 do not partake --of such oscillation. The ring 309 bears on a shoulder 299 on the pillar 249. One end of a flexible cable 323 is attached to the ring 309 and is wrapped around a segment of its periphery from which it extends around asegment of a sheave 32| and thence to an anchoring block 321.

In like manner, another flexible cable 325 is attached to the disk 309 and extends in the opposite direction around a segment thereof and thence around a segment of the sheave 32| its outlying end being fastened to an anchoring block 329. The blocks 321 and 329'are 'amxed to a stationary rod 323. Thcplates 303 and ,305-are r'angedtoslide onthe rod 328', and theshea-ve .32|1is carried by a pivot pin 3|9 secured to these plates."v Themechanism last described translates thew-to-iand-fro motions of..the knifecarriage 33 into oscillatory motions'of the -chip-clearing.mem-

ber 3 !12 When a shoe has been placed in the de'siredfpo- 2') This lever and'fa: member 333 arerigidly connectedto each other and both are mounted on; the fulcrumshaft '|6|'. The first effect of raising-the lever 9 is to shift a clamping member 334 against the, heelend of the shoe (Fig."15.) andthereby force the toeen-d of the shoe'against the bed blocks lit, 1The upward movement of 'atively thick, it is desirable, when trimming the the lever '9 is communicated to an "arm 349hy a resilient connection afforded by a spring plunger 315 which is carried by -a rigid arm 313 of'the member 333. The'plunger 315 abuts against a lug 361 formed on the; arm 349,;. The arm 313 is providedwith an "internally threaded socket in which an adjusting-screw ;311 is arranged Hand this screw "iSlJQlQCli to provide a socket ;for a compression spring and abearinginwhich the plunger 315 may slide; The opposite side of the arm 349 is thus'fmaintained initially against an abutment 369 formed onthe arm 313.; The applied force of the springplunger-315 may be regulated by turning the screw 311' and any position of regulation maybe maintained by providing the head 319 of the screw with grooves-3M to ,receive a conical point formed ona spring follower 383' that projects from the-member333. The arm 349 is also mounted-on the shaft |6| and the motion of the arm iscommunicated by a link 35| to a carrier 353. This carrier (see Fig. 10) has tongue-and-groove connection with a guiding member affixed to the frame 'I. The

clamping member 334 has tongue-and groove connection 355. with-vthe carrier353 and may be located at any one of thr ee positions alongthe length chitscarrier to provide for shoes of different lengths." Theclamping member-3341s bored and provided with v a spring-biased locking pin 3B3-and the carrier- 353 is provided with a series of three holes 365 to receive the pin;-

Assuming-thata shoe has beenclamped by the means above desc'ribed and that upward movement of the hand lever 9 is continued after the travel of the clamping member 334 is arrested by the shoe, the next resultis that the. clutch II is tripped to start automatic operation of themachine. $uch trippingwillnot be possible ,unless a shoe is present to arrest the travel of the clamping member 334 because mechanism now about to be described will not function unless the clamping member is arrested before the upward ,move- -ment of the lever 9 isterminated. For this purpose, a pawl; 331 is mounted on a pivot pin 335 carried by the member 333. This pawl may engage any one :of a'iseriesvof teeth formed on a member-339 affixedtoaportion 34| of a U-shaped rocker 343, both arms of which are mounted on the shaft |6|. A spring plunger39| carried by the member 333 engagestheback of .the pawl 331 to swing the latter toward the teeth of the mem upward/movement otth'ehand lever 9' is complunger 399. I A collar 4| I loosely surrounding the will :be: arrested-.whilethe pawl continuesto move.

7 A cavity 389 inthe? pawl nowi'recei'vestheabuti- .ment 385 and thetip of the pawl becomes lodged betweentwo teethof the member 339. Further municatedto the rocke'rl'343 by the pawl, where?- upon the rocker becomes effective to trip the clutch ll The details of the tripping mechanism .are hereinafter described; 1

T Assuming that automatic operation of the ma- 10 chine has been initiated in 'consequence of tripping the clutch; a cam: 391' carried bythe cam "shaft' l5 (Fig. '2) operates a'lever 395 loosely mounted on the shaft l fil- The purpose-of this .lever is to increase the force of the clamping .niember 334- against the heel end of hte shoe without necessarilyimparting any supplemental movement to the'clampingmember. The supplemental force will clamp the shoe sofirmly that it-may not he accidentally dislodged while the machine is in operation i i For the purpose last'mentioned, a plunger 399 is pivotallyconnected'to' the free end of the lever; 395 and extends loosely through-a bore ina' stud 40] that provides a'bearing for it. To providea'resilient forceagainst' th'e'stud 491 a compression spring 409 'is arranged to surround the plunger is located between the spring and a flat face 4j3 formedo'n the stud. The'opposite'end 1 of the spring abuts a'nut' 495 backedby a lock nut- 491 both of whichengage a screw-thread on the plunger and provide for regulating the initial defleciton of the spring. In addition to'extending through the stud'45'l the plunger also ex- 5 tends through a collar 411 that is retained on the plungerby a nut- 420. I I v The stud 401 is rotatably mounted in a forked arm 408 of a lever that also comprises a rounded end 423;. A bracket 42l bolted to the frame I 40 supports afulcrum pin 41 5 on which the lever 498, 423 is mounted. I I Movement of this lever is communicated to a bar 425 having jaws with which the rounded end 423 cooperates. The bar 4251s arranged to 1 slide in bearings inthe carrier 353 ('Fig.-l0 and is provided with a pawl 429 by which its'motion or the stress of the spring 459 may be communicated to the clamping member-334l The pawl 429is arranged" in an opening 421 in the bar 425 and is biasedby a springplunger'43l. A plate 433 afiixed to the carrier 353 is provided with a series of teeth any one of which may be engaged by the pawl, but when the bar 425 occupies" its The mechanism last described operates as fol lowsz'The clamping movement imparted to the heel-engaging member 334 by thehandle 9 will locate one of the teeth 0f the'p1ate'4'3 3 slightly to the right'of the right-hand edgeof the shield to develop supplemental clamping force, as the case may be.

Althou hthe ratio of the transmission gears If3 requires the'clutch shaft 5 to rotate at a faster 75 I on the casing 439. 1 initial position the pawl is disengaged from ther toothed plate 433 by a stationary shield 435."

rate of. speed than; the cam shaft l5, the clutchcontrolling mechanism about to be described is. governedby the rotation of the camshaft to stop the operation of the machine at the termination of one. revolutionof this shaft.

, Referring to Fig.1, a two-armed lever 341 is carried up andidown by an arm 345- of, the rocker: 3.43 to which it is connected by a pivot pin.

The upper arm of thelever 341 is arranged to be clutch casing 439'bolted to the machineframe I.

The casing 439 also provides a bearing fora pivot member 45l on which the lever 455, 459 is mounted. These parts initially occupy the positions shown in the drawings,- in which the toggle member 441' and a. cooperative toggle member 445 are maintained in theirlstraight relation 7 as shown in' Fig. 13 to hold the clutch out of operation. The toggle member 445 is seated in a clutch-controlling member 44 I suspended from a fulcrum pin443 in the casing 439. The interior I construction of the clutch is well known and for I that reason its details officonstruction are not herein illustrated. The construction is such that when the toggle is straight the clutch is disengaged but when the knee of the toggle is depressed the member 44! will swing about its supporting pivot 443 to engage the clutch. The

toggle is normally maintained in its straightv position by the upward pull of a tension'spring 449, the lower end of which is attached to an arm rigidly'connected tothe toggle member 441 by the rockshaft 453. v 1 7 When a shoe is correctly positioned in the machine to cause actuation ofthe rocker 343 in consequence of raising the handle 9, the de- -scribed connections depressthe knee of the toggle 4 45, 441; whereupon the clutch is set in operation and rotation of the cam shaft 15 is initiated. The starting movement of the arm 459 permits a rod 463 to descend by the force of gravity. This rod stands on the plate 46l and is arranged to slide in bearings 465 formed The purpose of this rod is to prevent the toggle 445, 441 from returning to its straight position untilthe cam shaft l5 has completed one revolution. Av roll at the upper end of the rod 453 is arranged to be engaged by a cam 461, the periphery of which is concentrio with the exception of a depression therein. Once the cam has turned far enough to carry its concentric portion into engagement with the roll the operator need no longer keep hold of the handle 9. ,In due course, the cam 469 will displace the lever 341 to disengage the lower arm thereof from the plate 461; but the rod 453 and the cam 461 will continue to maintain the arm 459 in its depressed position until the depression in'the cam is brought into register with the rod (Fig. 1) whereuponthe spring 449 (Fig. 13) will straighten the toggle 445, 441 to disengage the clutch.

Having described my invention, what I claim as new and desire to secure by Letters Patent of the United States is: I v

1. A trimming machine comprising a cutting bed having a U-shaped recess to receive the toe end of a partially fabricated shoe of which the lasting margin at that end is unsecured, shoeclamping means arranged to operate against the heel end of the shoe to press the shoe endwise against the wall of said recess, power-operated mechanism arranged to spread said lasting margin on said cutting bed and power-operated cutting mechanism arranged to cooperate with said cutting bed to sever surplus material from said margin.

2. A trimming machine comprising a cutting bed having a U-shaped recess to receive the toe end of a partially fabricated shoe of which the lasting margin at that end is unsecured, shoeclamping means arranged to operate against the heel end of the shoe to press the shoe endwise against the wall of said recess, said clamping means including relatively movable parts and resilient means by which their clamping effect is applied to the shoe, a power-operated clutch, mechanism operable by said clutch to spread said margin on said bed, mechanism operable by said clutch to sever surplus material from said margin, and means operable by said clamping means to initiate operation of said clutch in consequence of relative movement of said parts produced by clamping a shoe.

3. A trimming machine comprising a cutting bed having a U-shaped recess to receive the toe end of a partially fabricated shoe of which the lasting margin at that end is unsecured, a clamping member arranged to engage the heel end of a shoe, manually operable means by which said clamping member may be shifted to press the shoe endwise against the wall of said recess, a power-driven clutch, mechanism operable by said clutch to apply supplemental pressure of said clamping member against the shoe, mechanism operable by said clutch to spread said margin on said bed, and cutting mechanism operable by said clutch to sever surplus material from said margin. 1

4. A trimming machine comprising a cutting bed having a U-shaped recess to receive the toe end of a partially fabricated shoe of which the lasting margin at that end is unsecured, a plurality of gaging elements arranged to be engaged by the forepart of the bottom of a shoe to locate that part of the shoe heightwise in a predetermined relation to said cutting bed, means arranged to support the forepart of the shoe with pressure against said gaging elements, mechanism arranged to spread said margin on said bed, and cutting mechanism arranged to sever surplus material from said margin with movement away from the heel end of the shoe.

5. A trimming machine comprising a cutting bed having a U-shaped recess to receive the toe end of a partially fabricated shoe of which the lasting margin at that end is unsecured, spreaders arranged to spread said margin on said bed, power-driven mechanism arranged to operate said spreaders first with movement toward the heel end of the shoe and thereafter with movement in the opposite direction, and power-driven cutting mechanism arranged to sever surplus material from said margin with movement away from the heel end of the shoe.

6. In a toe-trimming machine of the type in which a knife is operated with movement away from the heel end of a partially fabricated shoe to sever surplus material from the lasting margin at the toe end, a series of relatively adjustable blocks having male and female formations nested one in another to provide an articulated cutting bed and forming a U-shaped recess to receive said toe end, means by which said blocks may be adjusted to regulate the width of said recess, mechanism arranged to spread said lasting margin on said blocks, and power-driven means arranged to operate said knife.

'7. In a toe-trimming machine of the type in which a knife is operated with movement away from. the heel end of a partially fabricated shoe to sever surplus material from the lasting margin at. the toe end, articulated blocks forming a U-shaped cutting bed and a U-shaped recess to receive said toe end, articulated supported blocks forming a U-shaped recess in which said bed blocks are nested, means by which said blocks may be adjusted to regulate the width of said recesses, and a thin flexible strip of steel lying between said bed blocks and said supporting blocks to partake of their Width regulation, said strip having a U-shaped shearing edge arranged to cooperate with said knife in the severing operation.

8. A trimming machine comprising a frame, an abutment affixed thereto and having a gaging surface, a U-shaped cutting bed, a U-shaped shearing blade in which said cutting bed is nested, movable means by which said cutting bed and said shearing blade are maintained in assembled relation, said means being arranged .on a portion of said frame to provide for shifting said shearing blade alternatively to a position in register with said abutment and to an operative position, cutting mechanism having a knife movable across said cutting bed and said shearing blade, and adjusting means carried by said movable means to adjust said shearing blade with edgewise movement against said gaging surface.

9. A trimming machine comprising a cutting bed having a U-shaped recess to receive the toe end of a partially fabricated shoe of which the lasting margin at that end is unsecured, cutting mechanism having a knife arranged to sever surplus material from a lasting margin spread on said cutting bed, spreaders arranged to spread said margin on said bed, two interconnected mechanisms each arranged to shift said spreaders toward and from the plane of said bed, one of said mechanisms having a toggle to furnish a component of such shifting movement, and means by which said interconnected mechanisms are operated successively to advance the spreaders toward said plane in successive stages.

10. A trimming machine comprising a cutting bed having a U-shaped recess to receive the toe end of a partially fabricated shoe of which the lasting margin is unsecured at that end, mechanism arranged to spread said margin on said cutting bed, cutting mechanism having a knife arranged to travel across said cutting bed to sever surplus material from the outspread margin lying thereon, a group of individually yieldable pressers carried by said cutting mechanism and arranged to travel ahead of said knife to press the outspread margin against said cutting bed, means arranged to locate the work-engaging portions of some of said pressers in more advanced positions than others, and means arranged to retract the more advanced pressers from said cutting bed While they are traveling thereover.

WILLIAM THOMAS BUCKINGHAM ROBERTS.

CERTIFICATE OF CORRECTION. Patent No. 2,2 6o,u 5.

y Y October 28, 19m. WILLIAM THOMAS BUCKINGHAM ROBERTS. It is hereby certified that erro I :f the above numbered patent requi secmd colump, line 15,- claim 7, for "supported" read -supporting--; and that he said Letters Patent should be me seme may conform to the record read with this correction therein that of the case in the Paten Signed and sealed this 25rd da 0 t Office.- r December, A.- D. 191m.

. Page 7,

Seal) Her lry Vari Arsdale, Acting Commissioner of Patents. 

